Xi Jinping yesterday took the stage in Davos to address the World Economic Forum, the first time a Chinese head of state has attended the annual January meeting in the Swiss Alps. Addressing the forum for nearly a full hour, President Xi took the opportunity to zero in on anxieties about the future of the global order provoked by the recent election of Donald J. Trump as U.S. President. Mr. Trump—who campaigned on renegotiating trade deals with China and an “America